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Time evolution of the PL spectra of FA0.66MA0.34Pb(I1–xBrx)3 perovskite films on PTAA/ITO-coated glass substrates under continuous 530 nm illumination at ∼1 sun equiv intensity for x = 0 (a) and x = 0.33 (b). (c) Evolution of PL intensity at 1.55 eV (0% Br) and at 1.60 and 1.74 eV (33% Br). Note the logarithmic scale of the time and intensity axes.
